package com.skku.selab.fl.communication;

import java.io.Serializable;
import java.util.ArrayList;

public class Coverage extends ArrayList<Message> implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 4178986406945389734L;
	
	private static Coverage cov = null;
	
	private Coverage(){
		
	}
	
	public static synchronized Coverage getInstance(){
		if(cov == null)
			cov = new Coverage();
		return cov;
	}
	/*
	public void expire(){
		cov = null;
		System.gc();
	}
	*/
}
